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Allowance for Credit Losses - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2020
Dec. 31, 2017
Loans and Leases Receivable Disclosure [Line Items]          
Allowance for credit loss $ 91,847 $ 30,616 $ 32,582 $ 49,529 $ 30,323
Threshold for loan analysis $ 1,000        
Minimum          
Loans and Leases Receivable Disclosure [Line Items]          
Valuation frequency period 3 months        
Maximum          
Loans and Leases Receivable Disclosure [Line Items]          
Valuation frequency period 12 months        
Financial asset originated          
Loans and Leases Receivable Disclosure [Line Items]          
Interest lost on nonaccrual loans $ 1,804 1,201 2,706    
Interest income on nonaccrual loans $ 701 $ 372 $ 1,475